Which of the following properties is shared by solids and liquids? Their particles are far apart. Their particles move randomly. They have a definite volume. They consist of charged particles.

Answer:

B)  1,370 kJ.

Explanation:

2C₃H₇OH(l) + 9O₂(g) → 8H₂O(g) + 6CO₂(g) , ΔH = - 1,830 kJ/mol.

n = mass/molar mass = (45.0 g)/(60.096 g/mol) = 0.7488 mol.

1.0 mol of isopropanol releases → 1,830 kJ.

∴ 0.7488 mol of isopropanol releases → ??? kJ.

∴ The enthalpy of combustion for 45.0g of isopropanol = (0.7488 mol)(1830 kJ)/(1.0 mol) = 1370 kJ.

So, the right choice: B)  1,370 kJ.

The enthalpy of combustion for 45.0 g of isopropanol is calculated to be 1,370 kJ by determining the number of moles and multiplying by the enthalpy of combustion per mole.So,option B is correct.

The enthalpy of combustion for 45.0 g of isopropanol, given that the combustion of isopropanol releases 1,830 kJ/mol and its molecular weight is 60.096 g/mol.

To find the enthalpy of combustion for 45.0 g of isopropanol, we should first determine the number of moles present in 45.0 g of isopropanol. This is done by dividing the mass of isopropanol by its molar mass:

Number of moles = mass (g) / molar mass (g/mol) = 45.0 g / 60.096 g/mol = 0.749 moles

Since the enthalpy of combustion of isopropanol is given per mole, we multiply the number of moles by the enthalpy of combustion:

Enthalpy of combustion = number of moles times enthalpy per mole = 0.749 moles times 1,830 kJ/mol

Therefore, the enthalpy of combustion for 45.0 g of isopropanol is:

(0.749 moles) times (1,830 kJ/mol) = 1,370 kJ

So, the correct answer is B) 1,370 kJ.

Answer:

When there remains one-quarter of the sample, the age of the sample is 10940 years

Explanation:

Step 1: Data given

The half- life time is the time required for a quantity to reduce to half of its initial value.

The half-life of C-14 is 5470 years.

This means after 5470 years there remains half of the C-14 sample.

When there will pass another half-life cyclus, half of the sample will remain.

Half of 50 % = 25% = one- quarter

This means 2 half-lives should have passed to remain a quarter of the sample.

Step 2: Calculate it's age

t/(t/1/2) = 2

⇒ with t = the age (or time) of the sample

⇒ with t(1/2) = the half-life time of the sample = 5470 years

⇒ with 2 = the number of half- lives passed  to remain one quarter of sample

t/5470 = 2

t = 2*5470 = 10940 years

When there remains one-quarter of the sample, the age of the sample is 10940 years

Answer:

Explanation:

Since, the acid is diprotic, you have that 1 mol of it releases 2 mol of hydrogen ions, H⁺.

Determine the number of moles of acid, using the molarity definition:

And the number of moles of H⁺ ions equals 2 × 0.0400 mol = 0.0800 mol

At the equivalence point of the titration the number of moles of H⁺ from the acid equals the number of moles of OH⁻ from the base.

Since, sodium hydroxide ionizes in a ratio 1 : 1 (1 mol of NaOH / 1 mol OH⁻), the number of moles of NaOH is equal to 0.0800 mol

And now you use the molarity definition for the 0.200 M sodium hydroxide solution:

That is the answer: 0.400 liter of 0.200 M sodium hydroxide.

Hi there,

Your answer is in the image attached above

Well, first of all you have to make a calibration curve with standard solutions, that is, with known concentration, and than you introduce your solution with unknown concentration. Based on the measured absorbance the apparatus will calculate for you the concentration of your solution. For more info pick up an analytical instrumentation book.

A spectrophotometer can help determine the molarity of a solution by measuring its absorbance and using previously established calibration with standard solutions. Once the concentration is known, the molarity can be calculated in conjunction with the solution volume.

A spectrophotometer can be instrumental in determining the molarity of a solution with an unknown concentration by employing Beer's law, which states that the absorption of light by a solution is directly proportional to the concentration of the absorbing species. First, a calibration curve is established using standard solutions of known molarity. You then measure the absorbance of the unknown solution and use the calibration curve to find its concentration.

To calculate the molar mass, you need the mass of the solute and the volume of the solvent. With these, the number of moles can be determined. In the given scenario of preparing solutions of a known molarity, one would weigh the correct mass of the solute, dissolve it in the solvent, and adjust the volume to the desired measure using a volumetric flask.

In summary, you would measure the absorbance, refer to your calibration curve, and from that, calculate the molarity of the unknown solution. This molarity, in conjunction with the volume of solution, allows you to determine the moles of solute present, which you can then convert to grams if necessary.

Answer:

0.10 M AlCl₃.

Explanation:

We can calculate the concentration of chloride ion [Cl⁻] in each salt:

MgCl₂ is dissociated according to the reaction:

MgCl₂ → Mg²⁺ + 2Cl⁻,

Every 1 mol of MgCl₂ produces 2 mol of Cl⁻.

So, [Cl⁻] = (2)*(0.1 M) = 0.2 M.

AlCl₃ is dissociated according to the reaction:

AlCl₃ → Al³⁺ + 3Cl⁻,

Every 1 mol of AlCl₃ produces 3 mol of Cl⁻.

So, [Cl⁻] = (3)*(0.1 M) = 0.3 M.

CaCl₂ is dissociated according to the reaction:

CaCl₂ → Ca²⁺ + 2Cl⁻,

Every 1 mol of CaCl₂ produces 2 mol of Cl⁻.

So, [Cl⁻] = (2)*(0.05 M) = 0.1 M.

LiCl is dissociated according to the reaction:

LiCl → Li⁺ + Cl⁻,

Every 1 mol of LiCl produces 1 mol of Cl⁻.

So, [Cl⁻] = (1)*(0.1 M) = 0.1 M.

So, the solution will have the highest concentration of chloride ions is AlCl₃.

From the given options, the solution of 0.10M AlCl₃ is the one that has the highest concentration of chloride ions.  

To know which of the given solutions has the highest concentration of chloride ions, we must evaluate each of them.

1) 0.10 M MgCl₂

We can see that in 1 mol of MgCl₂, we have 1 mol of Mg²⁺ and 2 moles of Cl⁻ ions, so if the initial concentration of MgCl₂ is 0.10 M we have:

[tex] [Cl^{-}] = \frac{2\: moles\: Cl^{-}}{1 \: mol\: MgCl_{2}}*\frac{0.10 \:mol\: MgCl_{2}}{1 L} = 0.20 M [/tex]  

Hence, in this solution we have 0.20 M of chloride ions.

2) 0.10 M AlCl₃

In 1 mol of AlCl₃, we have 1 mol of Al³⁺ and 3 moles of Cl⁻, so the concentration of Cl⁻ is:

[tex] [Cl^{-}] = \frac{3\: moles\: Cl^{-}}{1 \: mol\: AlCl_{3}}*\frac{0.10 \:mol\: AlCl_{3}}{1 L} = 0.30 M [/tex]  

Then, the concentration of chloride ions in this solution is 0.30 M.

3) 0.05 M CaCl₂

We can notice that in 1 mol of CaCl₂ we have 1 mol of Ca²⁺ and 2 moles of Cl⁻. The concentration of Cl⁻ is:

[tex] [Cl^{-}] = \frac{2\: moles\: Cl^{-}}{1 \: mol\: CaCl_{2}}*\frac{0.05 \:mol\: CaCl_{2}}{1 L} = 0.10M [/tex]

So, the concentration of the Cl⁻ ions is 0.10 M.

4) 0.10 M LiCl

In this case, in 1 mol of LiCl we have 1 mol of Li⁺ and 1 mol of Cl⁻, so the concentration of the chloride ions is:

[tex] [Cl^{-}] = \frac{1\: moles\: Cl^{-}}{1 \: mol\: LiCl}*\frac{0.10 \:mol\: LiCl}{1 L} = 0.10 M [/tex]

Hence, in this solution the concentration of the Cl⁻ ions is 0.10 M.

Therefore, the solution 0.10M AlCl₃ has the highest concentration of chloride ions.

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Answer:

H2SO4

Explanation:

H2SO4 is actually one of the strongest acids, coming to a pH value very close to 1. Acids transfer their hydrogen ions to other substances, such as water, and usually have hydrogen in their formula. In this case, H2SO4 has hydrogen in its formula and is the acid in this case.

Answer: [tex]H_2SO_4(aq)[/tex]

Explanation:

An acid is defined as the acid which completely dissociates when dissolved in water and release [tex]H^+[/tex] ions in their aqueous states.

A base is defined as the base which completely dissociates when dissolved in water and releases [tex]OH^-[/tex] ions in their aqueous states.

[tex]Mg[/tex] is an element, [tex]H_2[/tex] is a compound, [tex]MgSO_4[/tex] is a salt formed by combination of acid and base.

The equation for the dissociation of sulphuric acid is given by:

[tex]H_2SO_4(aq.)\rightarrow 2H^+(aq.)+SO_4^{2-}(aq.)[/tex]

Answer:

The Halogens

Explanation:

Group 17 element, Group VIIa element, halogen element

An element in Group 17 of the Periodic Table is most likely a halogen such as fluorine, chlorine, iodine, or bromine. These elements, known as main-group elements or representative elements, exhibit certain shared characteristics.

An element found in group 17 of the periodic table is most likely a halogen.

Group 17 of the periodic table, also known as the halogens, contains elements such as fluorine, chlorine, iodine, and bromine.

These elements share certain common characteristics including having one less electron than a neighboring noble gas and each halogen possessing 5 p-electrons (a p5 configuration).

This set of elements is also known as the main-group elements or representative elements. Other elements in this category include alkali metals (group 1), alkaline earth metals (group 2), pnictogens (group 15), chalcogens (group 16), and noble gases (group 18). A solid understanding of the periodic table and its groupings is a foundational aspect of chemistry.

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Answer:

103.06°C.

Explanation:

ΔTb = i.Kb.m,

Where, i is the van 't Hoff factor.

Kb is the molal boiling point  elevation constant of water (Kb = 0.51°C/m).

m is the molality of the solution (m = 2.0 m).

van 't Hoff factor is the ratio between the actual concentration of particles produced when the substance is dissolved and the concentration of a substance as calculated from its mass.

Mg(ClO₄)₂ → Mg²⁺ + 2ClO₄⁻,

1 mol of Mg(ClO₄)₂ produces 3 mol of ions (1 mol Mg²⁺ and 2 mol ClO₄⁻).

∴ i = 3/1 = 3.

∴ ΔTb = i.Kb.m = (3)(0.51 °C/m)(2.0 m) = 3.06 °C.

∵  ΔTb = the boiling point in presence of solute (Mg(ClO₄)₂) - the boiling point of pure water.

The boiling point of pure water = 100.0°C.

∴ The boiling point in presence of solute (Mg(ClO₄)₂) = ΔTb + the boiling point of pure water = 3.06 °C + 100.0°C = 103.06°C.

The boiling point of a 2.00 molal magnesium perchlorate solution is calculated to be 103.06°C by determining the van't Hoff factor and using the molal boiling point elevation constant for water.

To calculate the boiling point of a 2.00 molal solution of magnesium perchlorate, Mg(ClO₄)₂, we first need to determine the van't Hoff factor (i), which is the number of particles the compound dissociates into in solution. Magnesium perchlorate dissociates into one Mg²⁺ ion and two ClO₄⁻ ions, giving us an i value of 3. We use the molal boiling point elevation constant (Kb) for water and the molality of the solution (m) to find the boiling point elevation (ΔTb).

Since Kb for water is typically given as 0.51°C/m, the boiling point elevation can be calculated using the formula: ΔTb = i * Kb * m. Given that the solution is 2.00 molal, the boiling point elevation is:

ΔTb = 3 * 0.51°C/m * 2.00 m = 3.06°C

To find the final boiling point, you add the boiling point elevation to the normal boiling point of water, which is 100°C:

Boiling point = 100°C + 3.06°C = 103.06°C

Therefore, the boiling point of the 2.00 molal magnesium perchlorate solution is 103.06°C.

Answer:

The isotope with the greatest number of protons is:

Explanation:

The number of protons is the atomic number and is a unique number for each type of element.

You can tell the number of protons searching the element in a periodic table and reading its atomic number.

Thus, this is how you tell the number of protons or each isotope

Sample       Chemical symbol  Element       atomic number   # of protons

A Pa-238       Pa                         protactinium         91                        91

B U-240         U                          uranium                 92                       92

C Np-238       Np                        neptunium            93                       93

D Pu-239        Pu                        plutonium              94                       94

Answer:

Explanation:

The temperature of a substance is the measure of the average kinetic energy of its partilces.

The temperature, i.e. how hot or cold is a substance, is the result of the collisions of the particles (atoms or molecules) of matter.

The kinetic theory of gases states that, if the temperature is the same, the average kinetic energy of any gas is the same, regardless the gas and other conditions.

This equation expresses it:

Where Avg KE is the average kinetic energy, R is the universal constant of gases, N is Avogadro's constnat, and T is the temperature measure in absolute scale (Kelvin).

As you see, in that equation Avg KE is propotional to T, which means that as the temperature is increased, the average kinetic energy increases.

As the temperature of a sample of matter is increased, the average kinetic energy of the particles also increases. This is because higher temperatures result in more extensive vibrations of particles in solids and faster translations of particles in liquids and gases. The distribution of kinetic energies also becomes broader at higher temperatures, indicating an increase in entropy.

According to kinetic-molecular theory, the temperature of a substance is proportional to the average kinetic energy of its particles. Raising the temperature of a substance will result in more extensive vibrations of the particles in solids and more rapid translations of the particles in liquids and gases.

At higher temperatures, the distribution of kinetic energies among the atoms or molecules of the substance is also broader (more dispersed) than at lower temperatures. Thus, the entropy of any substance increases with temperature.

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Answer:

Reduction

Explanation:

Gaining electrons means reduction. When the electrons are on the reactant side of the reaction, they are added to the other reactant. This indicates that the Sn^4+ is gaining electrons and is therefore reduced (reduction).

Answer: Option (b) is the correct answer.

Explanation:

According to Afbau's principle, an electron enters the orbital with lowest energy first and subsequent electrons are fed in the order of increasing energies.

Copper is the element which has atomic number 29. It is a transition metal and atomic number of an atom determines the number of electrons present in an atom.

So, the stable electronic configuration of copper is as follows.

                [tex]1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{1}3d^{10}[/tex].

The electron configuration of an atom with an atomic number of 29 matches option C): 1s2, 2s2, 2p6, 3s2, 3p6, 4s1, 3d10. This configuration follows the Aufbau principle, showing how electrons fill up the lowest energy levels first.

The atomic number of an element defines the number of protons, and in a neutral atom, the number of electrons. For an atom with the atomic number 29, the number of electrons will also be 29. The electron configuration describes the distribution of these electrons among the energy levels and orbitals of the atom. For an atom with an atomic number of 29, this arrangement correlates to the option C): 1s2, 2s2, 2p6, 3s2, 3p6, 4s1, 3d10. This pattern follows the principles of the Aufbau principle, which prescribes that electrons will fill the lowest available energy levels before moving up to higher energy levels.

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Answer:

Explanation:

G is the symbol used for the Gibss energy, also known as free energy.

G measures the useful energy, i.e. the energy that can be used to perform a work.

G = H - TS and the change in G is given by δG = δH - TδS.

The sign of δG tells if a chemical reaction is spontaneous or not.

If δG is positive the reaction is non-spontaneous, if δG is negative the reaction is spontaneous, and if δG = 0 the reaction is at equilibrium. This can be written as:

Then, as to the given statement, it is completed with the term non-spontaneous, which corresponds to the description of a chemical reaction that has a positive δG.

A chemical symbol represents the shorthand of an element. It is a one- or two-letter abbreviation that is used to represent an element in chemical formulas and equations.

The first letter of the symbol is always capitalized, and the second letter is lowercase, if there is a second letter. For example, the chemical symbol for hydrogen is H, the chemical symbol for oxygen is O, and the chemical symbol for carbon is C.

Chemical symbols are derived from the Latin names of the elements. For example, the chemical symbol for hydrogen is derived from the Latin word "hydrogenium," which means "water-former."

Chemical symbols are an important part of chemistry because they allow chemists to communicate with each other easily. They also help to simplify chemical formulas and equations, making them easier to understand.

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A chemical symbol is a one- or two-letter designation that represents an element's name, used for single atoms or larger quantities.

A chemical symbol represents the name of an element. It is a one- or two-letter abbreviation that signifies a single atom of an element (microscopic domain) or a collection of atoms within a sample of that element (macroscopic domain). For instance, the chemical symbol for mercury is 'Hg'. Many chemical symbols are derived from their English names, with the initial letter capitalized and any subsequent letter in lower case. For example, 'O' represents oxygen, 'Zn' represents zinc, and 'Fe' represents iron. Certain elements, particularly those known since ancient times, retain symbols based on their Latin names. Chemical symbols are also used to create chemical formulas that show the types and numbers of atoms in a molecule of a compound.

Answer:

[tex]\boxed{\text{14}}[/tex]

Explanation:

If l = 3, the electrons are in an f subshell.

The number of orbitals with a quantum number l is 2l + 1, so there

are 2×3 + 1 = 7 f orbitals.

Each orbital can hold two electrons, so the f subshell can hold 14 electrons.

[tex]\boxed{\textbf{14 electrons}} \text{ can share the quantum numbers n = 4 and l = 3.}[/tex]

Here we want to find the number of electrons that an atom can have for some given quantum numbers.

We will see that this atom can hold 14 electrons.

Now let's see how to get that answer:

We know that for an atom with quantum numbers n and l, the orbitals can take the values from -l to l, so we will have 2*l + 1 orbitals.

And in each one of these orbitals, we can hold a maximum of two electrons (one for each spin, remember that these are fermions, thus we can't have two of them in the same state, so we can't have two electrons in the same orbital with the same spin, this is why each orbital can hold a maximum of two electrons).

Then the number of electrons that an atom with quantum numbers n and n can hold is:

2*(2*l + 1).

Now we have.

n = 4

l = 3

Then the number of electrons that this atom can hold is:

e = 2*(2*3 + 1) = 2*7 = 14

This atom can hold 14 electrons.

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Answer:

Explanation:

There are three kind of chemical bonds: covalent, ionic, and metallic.

The chemical bonds are the result of the interaction of the valence electrons of the atoms.

The valence electrons may be:

        Thus, this is the answer to your question: a covalent bond is formed as the result of sharing electrons.

A covalent bond is a type of chemical bond that forms when atoms share electrons to complete their valence shells, thereby creating an attractive force between atoms. These types of bonds can be nonpolar when electrons are shared equally, or polar when there's an imbalance in sharing. An example of covalent bonding is seen in the formation of a water molecule.

A covalent bond is a type of strong chemical bond that is formed between two atoms of the same or different elements. This bond occurs when atoms share electrons in order to complete their valence shells or the outermost shell of an atom that contains its most reactive electrons. This sharing of electrons is an attractive force between the nuclei of a molecule's atoms and pairs of electrons between the atoms. There are various types of covalent bonds. When the sharing of electrons between atoms is equal, the bond is considered nonpolar. However, when electrons are not equally shared due to differences in electronegativity, the bond is said to be polar.

An example of covalent bonding is the formation of a water molecule where hydrogen and oxygen atoms combine and are bound together by covalent bonds. The electrons from the hydrogen split their time between the incomplete outer shell of the hydrogen atoms and the incomplete outer shell of the oxygen atoms. In order to completely fill the outer shell of oxygen, which has six electrons but would be more stable with eight, it requires two electrons (one from each hydrogen atom). Thus, it results in the well-known formula H2O where electrons are shared between the two elements to completely fill the outer shell of each, making both more stable.

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Answer:

Explanation:

There are two kind of nuclear ractions: fusion and fission reactions.

Both release a huge amount of energy in different ways.

Fusion reactions are nuclear reations in which two smaller (lighter) atoms combine into a larger (heavier) atom, with the respective release of energy.

That is what model 1 shows:

That is the process that happens and is responsible for the huge amount of heat produced in and released by the Sun.

In the Sun two atoms of hydrogen fuse into a larger atom of helium.

That is represented by the nuclear reaction:

Since fusion reactions need extremely high temperatures and pressure to start and keep going, the technology to use them economically is still in development.

Fission reactions involve the split of the atom into smaller (lighter) atoms, releasing a huge amount of energy.

That is depicted by the model 2:

As you see one atom is being splited in two atoms with release of energy.

And indeed, that is the technology used by the nuclear power plants.

An example is the fission of uranium-235

Answer:

c. Model 1 shows reactions in the sun and Model 2 shows reactions in the nuclear power plants is correct

Explanation:

I got it right :)

Answer:

See below  

Explanation:

Ice and water are in equilibrium with each other at 0 °C.

Steam and liquid water are in equilibrium with each other at 100 °C.

Answer:

30 i think

Explanation:

Answer : The correct option is, It would float.

Explanation :

As we know that the density of water is, 1 kg/L.

The given density of block is, 0.500 kg/L.

As per question we conclude that, the density of substance (block) is less than the density of water. So, the block will float in the tank of water.

Hence, the correct option is, It would float.

Answer:

0.9 J/g.°C.

Explanation:

Q = m.c.ΔT,

where, Q is the amount of energy (Q = 132.8 J).

m is the mass of Al (m = 11.17 g).

c is the specific heat capacity of Al (c of Al = ??? J/g.°C).

ΔT is the difference between the initial and final temperature (ΔT = final T - initial T = 28.94°C - 15.73°C = 13.21°C).

∵ Q = m.c.ΔT

∴ (132.8 J) = (11.17 g)(c)(13.21°C).

∴ c = (132.8 J)/(11.17 g)(13.21°C) = 0.9 J/g.°C.

To find the specific heat of aluminum, we use the formula of heat transfer Q = mcΔT where Q is heat (132.8 J), m is mass (11.17g), ΔT is the change in temperature (13.21°C). Solving this provides the value of the specific heat of aluminum.

The specific heat of aluminum can be calculated using the equation for heat transfer: Q = mcΔT, where Q is the heat supplied, m is the mass of the substance, c is the specific heat capacity, and ΔT is the change in temperature.

In this problem, the values are given as Q = 132.8 J, m = 11.17 g, ΔT = 28.94°C - 15.73°C = 13.21°C.

Substituting the values, we get 132.8 J = 11.17g * c * 13.21°C. To find the specific heat (c), you rearrange the equation so c = Q / (m * ΔT) = 132.8 J / (11.17g * 13.21°C).

Therefore, by solving this the value of c (specific heat of aluminum) can be calculated.

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Answer:

D) The equilibrium will shift to the right and more precipitate will be formed.

Explanation:

BaCl₂(aq) + Na₂SO₄(aq) ⇄ 2NaCl(aq) + BaSO₄(s)↓,

Adding more BaCl₂ to the system:

will increase the concentration of BaCl₂ (reactants), so the equilibrium will be shifted to the right side (products side) to suppress the effect of increasing the BaCl₂.

D) The equilibrium will shift to the right and more precipitate will be formed.

Obiously A is the answer.

Final answer:

The sigma bond between C₂ and C₃ in propyne is composed of sp-sp hybrid orbitals resulting in a linear geometry with an approximate bond angle of 180°.

Explanation:

In propyne (CHCCH₃), the bond between C₂ and C₃ involves the sigma (σ) bond formed by the end-to-end overlap. The atomic orbitals involved are sp hybrid orbitals on both C₂ and C₃. Specifically, the sp-sp sigma bond formation allows for the triple bond between these two carbons, with the additional bonding areas occupied by pi (π) bonds.

Concerning the bond angle, C1-C₂-C₃ would exhibit a linear geometry typical of sp hybridization. Therefore, the approximate bond angle is 180°. This structure is in accord with the linear geometry of sp hybridization, as seen with acetylene or ethyne (HC≡CH) molecules.

The sigma bond between C₂ and C₃ in propyne is formed by an sp orbital on C₂ overlapping with an sp₃ orbital on C₃, leading to a strong carbon-carbon single bond. The C₁-C₂-C₃ bond angle in propyne is approximately 180 degrees due to the linear geometry of sp hybridized carbons.

The atomic or hybrid orbitals that make up the sigma bond between C₂ and C₃ in propyne (CHCCH₃) involve the overlap of an sp orbital on C₂ with an sp3 orbital on C₃. This type of overlap leads to the formation of a strong and shorter carbon-carbon single bond. In propyne, the C₂ carbon is part of a carbon-carbon triple bond, which is composed of one sigma bond and two pi bonds created by the overlap of two sp hybridized orbitals for the sigma bond and two unhybridized p orbitals for the pi bonds.

The approximate C₁-C₂-C₃ bond angle in propyne would be around 180 degrees due to the linear geometry enforced by the sp hybridization of the carbons involved in the triple bond. This linear geometry maximizes the overlap between the involved orbitals, resulting in a strong triple bond consisting of one sigma and two pi bonds.

Answer:

When the substance is cooled, its temperature will fall below 78 °C after 100% of the vapor has changed to liquid.

Explanation:

The accurate statement is that the temperature of a substance with a boiling point of 78 0C will fall below this temperature once all the vapor has condensed into liquid, as the phase change maintains the boiling point until the transition is complete.

The statement about a substance with a boiling point of 78 0C that is true is: When the substance is cooled, its temperature will fall below 78 0C after 100% of the vapor has changed to liquid. At the boiling point, a substance undergoes a phase change from liquid to vapor, and it remains at this temperature until the liquid has fully transitioned into vapor. Therefore, the temperature won't rise above the boiling point until all the liquid has become vapor. Conversely, when cooling, the temperature will not drop below the boiling point until all vapor has condensed back to liquid.

This is due to the energy being used to facilitate the change of state rather than altering temperature. Similarly, when a substance is melting or freezing, the temperature remains constant at the melting point until the transition between solid and liquid is complete.

A= 56

B= 27

c= 12

D= 8

E= 3

F= 3

G= 1

H= 1

is what the edg. example shows but any answers are accepted!!

Some tips to follow when doing lab practicals are:

This refers to the systematic research that is done in a scientific process in a controlled environment to test or prove a hypothesis.

Hence, we can see that your question is incomplete because it does not show the radioactive atoms and their data from the given lab work, hence a general overview is given for better understanding.

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Answer:

126.63 g.

Explanation:

no. of moles (n) = mass/molar mass

no. of moles MgCl₂= 1.33 mol & molar mass of MgCl₂ = 95.211 g/mol.

∴ mass = no. of moles * molar mass = (1.33 mol)*(95.211 g/mol) = 126.63 g.

Answer: Copper is being reduced

Explanation:

Answer: The correct answer is copper is getting reduced.

Explanation:

Oxidation reaction is defined as the reaction in which an atom looses its electrons. Here, oxidation state of the atom increases. These reaction are shown by reducing agents.

[tex]X\rightarrow X^{n+}+ne^-[/tex]

Reduction reaction is defined as the reaction in which an atom gains electrons. Here, the oxidation state of the atom decreases. These reactions are shown by oxidizing agents.

[tex]X^{n+}+ne^-\rightarrow X[/tex]

For the given chemical reaction:

[tex]Cu^{2+}(aq.)+2e^-\rightarrow Cu(s)[/tex]

Here, copper atom is gaining 2 electrons to form copper metal. Thus, it is undergoing reduction reaction and is getting reduced.

Answer: 2.80 Atm

Explanation:

Gay-lussac's law

P1÷T1=P2÷T2

T2·P1÷T1

(200)·(4.20)÷300